CD20 Monoclonal Antibody Combined With BTK Inhibitor for the Treatment of Refractory Immune-related Cytopenia

May 19, 2026 updated by: Qi deng

Clinical Study on the Treatment of Refractory Immune-related Cytopenia With CD20 Monoclonal Antibody Combined With BTK Inhibitor (BTKi)

This study aims to utilize anti-CD20 monoclonal antibodies to eliminate peripheral B cells and reduce the mechanism of autoantibody production, as well as combine the mechanism of BTK inhibitors (BTKi) blocking the B cell receptor signaling pathway and inhibiting B cell activation and proliferation, for the treatment of refractory immune-related cytopenia. In this study, it includes the salvage treatment of immune thrombocytopenia (ITP) and autoimmune hemolytic anemia (AIHA), expecting to achieve a synergistic and enhancing effect. This study aims to select Zuberitamab, a human-mouse chimeric anti-CD20 monoclonal antibody, and the BTKi Orelabrutinib as combination therapy options. The clinical efficacy of the Zuberitamab-Orelabrutinib combination therapy (overall response rate, duration of sustained remission) will be evaluated, along with its safety profile (including infections, bleeding, cardiac toxicity), to provide a theoretical basis for their combined use in treating refractory immune-related thrombocytopenia (ITP and AIHA).

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Not yet recruiting

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Estimated)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
30

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Phase 1

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

  • Adult
  • Older Adult

Accepts Healthy Volunteers

No

Description

Inclusion Criteria:

  • Diagnosed with refractory immune-related cytopenia, including immune thrombocytopenic purpura (ITP) and autoimmune hemolytic anemia (AIHA);
  • Age ranging from 18 to 80 years old (inclusive of 18 and 80);
  • Expected survival time > 12 months;

  • Good function of major organs:

    1. liver function: ALT/AST < 3 times the upper limit of normal;
    2. kidney function: creatinine < 100 μmol/L;
    3. lung function: indoor oxygen saturation ≥ 95%;
    4. heart function: left ventricular ejection fraction (LVEF) ≥ 50%;
  • Peripheral superficial venous blood flow is unobstructed, capable of meeting the requirements for intravenous infusion;
  • Karnofsky score ≥ 60, ECOG ≤ 2 points.

Exclusion Criteria:

  • Women who are pregnant (with positive urine/blood pregnancy test results) or breastfeeding;

  • Those who have severe underlying heart diseases when participating in this study, including:

    1. clinically significant atrial fibrillation (AF),
    2. cardiac conduction block,
    3. myocardial infarction (within 1 year),
    4. congestive heart failure (CHF);
    5. cardiac echocardiography LVEF < 50%;
    6. New York Heart Association (NYHA) cardiac function classification of III-IV grade;
  • Those with active bleeding or bleeding tendencies, and those who need to take anticoagulant drugs;
  • Those with organ dysfunction or uncontrollable coexisting diseases;
  • History of malignant tumors;
  • Those with active chronic hepatitis B or active hepatitis C;
  • Known history of human immunodeficiency virus (HIV) infection and/or acquired immunodeficiency syndrome;
  • Those with uncontrollable infectious diseases;
  • As determined by the investigator, other unsuitable conditions exist.

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: N/A
  • Interventional Model: Single Group Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Experimental: Zuberitamab-Orelabrutinib combination therapy
This study is designed as a non-randomized, single-arm, open-label clinical trial. Patients with refractory immune-related cytopenia, including immune thrombocytopenia (ITP) and autoimmune hemolytic anemia (AIHA), are intended for enrollment. The treatment regimen and schedule are as follows: anti-CD20 monoclonal antibody (Zuberitamab): 100 mg per dose on Days 1, 8, 15, and 22; BTK inhibitor (Orelabrutinib): 50 mg once daily (qd) from Day 1 to Day 90.
Drug: Anti-CD20 monoclonal antibody and the BTK inhibitor
This is a novel combination regimen of anti-CD20 monoclonal antibody plus BTKi, specifically designed for patients with refractory immune-related cytopenia.

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Measure Description
Time Frame
Evaluate the Median overall response rate at 6 months of anti-CD20 monoclonal antibody and BTKi combination therapy in refractory immune-related cytopenia
Time Frame: Six month after treatment initiation
Median overall response rate at 6 months after treatment initiation
Six month after treatment initiation

Secondary Outcome Measures

Secondary Outcome Measures

In a clinical study's protocol, a planned outcome measure that is not as important as the primary outcome measure for evaluating the effect of an intervention but is still of interest. Most clinical studies have more than one secondary outcome measure.
Outcome Measure
Measure Description
Time Frame
Evaluate the early overall response rate 3 months after the start of anti-CD20 monoclonal antibody and BTKi combination therapy in refractory immune-related cytopenia
Time Frame: Three month after therapy
The early overall response rate 3 months after the start of treatment
Three month after therapy
Evaluate the sustained remission rate that lasts for 6 months after achieving remission following anti-CD20 monoclonal antibody and BTKi combination therapy in refractory immune-related cytopenia
Time Frame: Six month after achieving remission
The sustained remission rate that lasts for 6 months after achieving remission
Six month after achieving remission
Evaluate the Incidence of Treatment-Emergent Adverse Events (Safety and Tolerability) of anti-CD20 monoclonal antibody and BTKi combination therapy in refractory immune-related cytopenia
Time Frame: Up to three month after therapy
The incidence and severity of therapy related toxic reactions (including infections, bleeding, cardiac toxicity)
Up to three month after therapy

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
Qi deng

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Estimated)

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
June 1, 2026

Primary Completion (Estimated)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
May 31, 2028

Study Completion (Estimated)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
May 31, 2028

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
May 1, 2026

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 1, 2026

First Posted (Actual)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
May 7, 2026

Study Record Updates

Last Update Posted (Actual)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
May 22, 2026

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
May 19, 2026

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
May 1, 2026

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • 2026-50

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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